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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29657a5ff15262ac03188b150f9977809608154ca9699386b214c983a18e3cec' 
  AND token = 'X3XOZbT+1hkdRA4pnuoO1QSuVH0gNOEH0yI7GAX6zC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}