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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d790a66c1bebcada3efc0fd62064c2b6c941f702dfb583fa35d7e8372d668c7' 
  AND token = 'qyWpizmfks2bBwyN3/QV4s5CR3SNWjHRyg+/OS7X/T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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