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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0b87444eb5139089f1133bbc292393db54d93ad43d1025b0f18b3cda9a99225' 
  AND token = '8GGf0W7rD9qLkakF4izKhM9zTdsyQBO8Roxj44rMvvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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