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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b21ab4ec93f48de9a9e843c9e9f9173b4fe57d77b5bf1aa9c1981d4f0e559f7' 
  AND token = '6EYxRc902j9hcoPEtPvwlgWSjgkH+J0sUfkar9hNvTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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