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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dcbe42b9501bdb06880a4cca76e67f97ed4a7971bd49d4445992bc2722322d8' 
  AND token = '6RRRO20fg1OyqEUHcc004ZT/56ZvsHLC8VwFmxZgUsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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