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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7141250ab9aebd73aa4b5e2128ab0fae9c1f8bdb86b79c0d20535fcf7ca6d924' 
  AND token = 'du6RN68Dtz3ylJYlyebtVFe4wF2du6I0TSOX6ybmyHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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