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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c93e99db5fce4581a2d8314d6083550a5f971e3f27eacf168c9f0f06aaf25dd' 
  AND token = '2zZ2pqC5fBlsP0a22xvE33KsN22M2Ty2I5FyR7RLTSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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