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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f7de76da1ec1d7d5188838995856f7209300e8c928029db5e23124fe0c66a0' 
  AND token = 'bgcuVnNLOKhy4pSj3h1eL0ZTGR99+MWQG7pLuEYt+wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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