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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e63732fd324f871bbe1e74449ad68e872738e37e350da9b78544bbc73c8a9b8e' 
  AND token = 'UuPZWZuxpoeKBgaRz7t7gsTGY0bsck+xfJOixCWT6PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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