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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '063e5c7b156c67760f0400d066f31dc9234c68c16496ec6fa12da9bd44bd5efc' 
  AND token = '2mAXUHmr5HFLs5TLE4thEg9J1pCJu1zIJgan6XbgIEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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