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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcddda7de0e2c2c34a225b6b3a4adbb2573b45bc7358a98232a0ab4fc57cdc3f' 
  AND token = 'fUofsLfcwy/F0gVVZvr7lkOoqeXxC3i9mlhNs1KzdkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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