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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92daf6bb2a825e1b69de873ce3dbbc72306170d2ec3e2f12bef28f37d20010e' 
  AND token = 'FWDwSp7WCIxVjsdh7CHdsoVqQ3kR8UgzONoa8p/dA5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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