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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e170b2e74a5363c16ac8ee3b3c910ca6ebd6716857ab816b74872dbc525a91f6' 
  AND token = 'FdgSN/kykRvBXD/Cmo3ZjlNPmDqjfueXng2pcQpxG48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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