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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b31d8610675fbe9e7b8a09853572acb95b06ca9bccfc2a4f33ed02a4c14ea45d' 
  AND token = 'TKg4bapeUmcG0hoqKmhaEiIfvx7c2oRIGZo9SodzKmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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