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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01555e6fba42dee2b10a185246b4ce289874466205b55d6f956cbe0927fb6406' 
  AND token = '2mZuhxzO+1uraO2TrmbocOJZCITJudJ7fm76gN+ls6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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