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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b4a666d91af4a6d9e1fe958449035d5938b6e584900284fef3cb99ef28cd3e8' 
  AND token = 'NBgsSvey5gtgXneZnGw9QKz7Wsq/I5vfH7SsRmahvv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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