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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1e29c71a8c79a1e3d76dfe306d29cec755518ff4a40f9ed9f447568c6c8e3bb' 
  AND token = '+NOm6hWrksPqvYDr8sALrXfjiSNb/makfD6Ssun7tFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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