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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35e5f5b28ce381468fe52d78fa9ae9e78779b389552dc4b0ab6732aeaee51d2b' 
  AND token = 'dnRXpGCujsnwtfN5jH30INTnO/vKFI+wPQw0YQcM7FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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