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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd06b404da59aababdb0ed07e2a8617a6694b8bbaf527004852e8f5f01f69d949' 
  AND token = 'tC3LLHUrz+C64YJP03W8ddKY/rX3fbWUFn+f2uazMB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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