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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee8a480a8d22fcc626da578869ffeeaae4494b9d00fc9a8261e6c23182842e8' 
  AND token = 'njkZDMEkaDngN7hUuPCEfXd8lGGhxnTmpQgBxU+gSwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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