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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfa346976e75a616e5b868b758f581f69d2d8b9002a7b5967bdc8ad784e929ce' 
  AND token = '9qfuSI0bgmjEe7YIm36UiBBBCJRz0BuovEE2x+wJxhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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