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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c7e4f3e0028047b6f716cc29edf2ed584cd9335b5d69876b20da2bad7894bf2' 
  AND token = 'paEjdbX+CWSXCQnLvAG3s1IR5LC9vgxenxXP56whYxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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