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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92cccdba266125aa1bf2233be444b9d7a857e234b5396a32db24884df48d69df' 
  AND token = 'WUP9DN0ieZSizlUnkeNCMzHEyU9tk2U/T7iQELNhfYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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