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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a261be805f388ef9883082b8d0528c6e4323fa7532e6fc9f8ae5a513d1a5d55' 
  AND token = 'i+f9p34HsZFmkNUe+PSGu5Vv702t0jch5EAc3K4qkhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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