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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dfe3eefa3da1090ceef0950f40c637f5137f7a9472c5d0c28f0c1df16beabf1' 
  AND token = 't/cXkGc2xMD3/g6FWu9zgcNZwuViJg9hg4wC+nRqQX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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