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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1801c5dde2d54b7f3e4682d1c674f6b2ae66e73fa770c069d17780a39a3aa35c' 
  AND token = 'SAmJWWKOGP1fWpNqNSVhmNUpxyp9rFxw0oY5X/3deao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00232

JSON explain

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