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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffc9ef8cd3aaa2930b4f2b8111a9a3ce11a3ed4a682857976a639f93fd6a9fac' 
  AND token = 'KdtlwX/8aIrc8JCWGzo3476wFD9Of6GbD51wP7QycR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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