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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28622b393a936fe793fa2ed39cd79210b5727f403cf2193d9c28529bc402d3c3' 
  AND token = '7nZr85eBrR8ORbsXx8UnOAr4M8HCl88fenwyM1D1UzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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