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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '094bddf9712106dc5f98983f42aed2f743447cca8a6b293f48dd8dfdd05f2973' 
  AND token = 'Y1ex11EFoaCP2IB6DBQ5WP+0nLoYMjx+FNZw9mf78VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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