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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '835f3c16a9ab2e348499f7bc6bcb3fe3cd1485203af94d87459b7ffda78c23ab' 
  AND token = 'Ypm5qM2rNlx5LnG4Ip4CdKi7qc9RC9ra9edCqzRMG9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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