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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6290ab4753f24fdf252366d0bb68112a07480a2db661d6855ae8da0fe5ab4fa3' 
  AND token = 'u7qf7krb2QSmwEkmCXvfvfCjdGsl00I340ThWecoGok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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