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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da42b053b2f0401f6d5111d4cdbfa14a6649ba96c41e2931d11f3eef2e1e6f8b' 
  AND token = 'GgDGYURzLnto6gcw1NObZGKIVJxT9Aj+H0coDJk/dSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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