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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39fa38dd618aaf5a4e38f5fda9f5a17a010932c05f1d7806e85acb1be7b186e2' 
  AND token = 'Us1REEfiV6dydV8FNQ/JMINR07QAG/TsI0/YuqoF0xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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