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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8022c555806ed6ca042f6f6d7a2200ea33cc19fe96ddd0eff6a47330c7ba8e6b' 
  AND token = '0LyiGEf+1c4YQTqSTEXl+B6VF9tqUrjyWKpj+/WelOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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