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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '946dfb81ce295300fcbdf4ae1866b98e89071ea7124ef4fe6ff96051d549fc3e' 
  AND token = 'YLACOs+1Pvsex23l+6yc6/k3r0wCuzmsKX4jU2znTg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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