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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '571468e6144451ab3a337da05f5a1637f967481db722309f1aae44bd109a0c45' 
  AND token = '23HpbBnS6NhFwFCbFjwOlKKijr6ywdfUWR3VsSO/kY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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