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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5af41421c6d8595002a4db4cf8780b986582479d12fa881d87d2bef61a327c' 
  AND token = 'W8vFXf12hoFekdSw/suaihZ5OZu7mAv2nR6gun3Iyc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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