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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abc69e14b4795aad23670f3f43e3c9525a1dee7dbcdabddb982ce6a3c3ffe326' 
  AND token = 'Mb9jLen7JZgDG9aTvP2uxe4V7dxccow3ek9cz1u5w7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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