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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64da7ec8285a7769cb0351c344b6c1ba00ae2b85d6b55280ddc04baaa4e91beb' 
  AND token = 'omme77QkjmgAIHnSoyov2eXdK2VAGFb0cNktDR7OmW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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