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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b416c2c91048d17d0448112a5d015987e99947d73bac436c0ad0bb440ecc73ac' 
  AND token = 'rm3rXTSP9qhGy82c6pDBZhKYdN4lHX7lcSKgCIhZ948=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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