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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7b6b63417a08a193607cd891eaa9ae01b778f1a59f1ecfa7929aac9ac42c047' 
  AND token = 'TRPqNcXGP6bCBkgBY3PNlg/L1HkD6J/StpYlni1bsOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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