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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc88289abc45d4d3342be06ffa34a943901e182cbd698319732fb067feb756b' 
  AND token = 'TqyPBJF+DU0ehplMPnkBoLY/3bty54QdIdXI7txcJYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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