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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a024a230de516f4441363f1faafec56204007b0298ed6c12256209204abc348' 
  AND token = 'OQbmV4yA/CvAnlsE/k86rOXFsiPcp4/LzLrfX8C4wQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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