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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c758ac718b5d91bb0d9476ffbd144ac75da97e8320924766cb39f7f4ef62beb' 
  AND token = 'gd7rS/b4FBzKj2Vy2qmluQlsfk1XudF58StMxcOcpyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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