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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d8fb8d89c7ad96b323a9d64a305a2e4cb2e0ccd455d9dd1a358a06c4c08f93' 
  AND token = '+NW0NfmGvUcNtrGdNmuvxvDKxEFtxaYsZEM6L1EhtxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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