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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79b9f3f03c9b97c95cec1af5191e7f514a5fd19800ae38728c017f7e3fe94320' 
  AND token = '+axM+ooZt6yxCaJuNpwm7OwwLR+XCnf7NWj5iXH1ugM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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