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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c889ce025d12ffa94a3f3be364c5f29e9781092f6942cde08e161ad3e8ad6c5d' 
  AND token = '3cSI52zcKJeyzeXfJPl8abO7jbYcuDKtmEyHcfzp2XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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