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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af07330556d0f31ecbdf15487b33301e06fed4d7ccdd83fa8492c41934bcdec7' 
  AND token = '9Bmll+jOx8CLZBGcKHXNNIxO8NkE5fppq7OFzfBsTfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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