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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ec8cd89b368d767dc25be9e271096c820276b695df47fd2beee4ec667d7b00e' 
  AND token = 'VfBWWZd5wL4CV0DjWeKDEZRTrkc6P5whM/oHN55iFPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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