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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adce3e4b84be277d0b40f310f8bc3626ac191ef0451bc489ca489b69f0f59cc8' 
  AND token = 'zSsvxjqCRzIfiE1Ew2giLyi4ZYfLNtFtYMSrmcIy1+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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