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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dda31d1d467bf350b3f42dac8d6e2ad72bf9a8c04b44d5f3b044559e69a14e25' 
  AND token = 'pn3TCl0accaARXijQZbmRYFfrhGgZuDsdYoKo2Wt+Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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