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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc87c9280ac839b112ac96f93417243c4fe2d5da2a70365a7577e10f13f9556b' 
  AND token = 'H40S4PksyVRtQnPeqCeuTr+yX92C9geGaObAn9kh4l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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