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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd510051faeda32237a742dac7656eeac322b4df55e84950cebeff3fb9f362a28' 
  AND token = 'V9X8lVzyfPFP/aj+D///etj9QgvxnAsfO+9TAFr3wos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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