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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa1f7eff1fc6d601d45b566c7dce0b9026b63d3199af08228cf27f57cee922e6' 
  AND token = '05vl9i5uB2ktlOm4JxvMITz6XSNkZZREXvRq7po17t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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