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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23695925ea0a4469584e33273182999e7ed1d9f3fbe106f62d9d0078a1f85f58' 
  AND token = '4A5TkK8jpm5pqLoZXwUP5txWR9CgrQZuOVALKVsbyoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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