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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '825292bd7f7376ed044665cfb1df8f9c50e6c6c14de880996bf22c235a417047' 
  AND token = 'NtIf2YjskFeYQ9YfTJRpO2nYzve5qCChIKB9OtblT9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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