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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '039df2c7d03e2865903ab2fdc3fd2eaaea3b46e2e747b655eecb51cc260c4cfd' 
  AND token = '1MH8DBNjqKiWTiZrPp8valVXTxRsdk7knEPw9LnTswY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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