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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9e12be9ef68140b1578d7669ff8b172fc9dff3ec3103bb2a5c1bec427e43c34' 
  AND token = 'gZWt2zynsD2lwN+TrVaMoehu1MtYlyqteqCesJmbmqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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