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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c048eb435bec546dd8d059c85ff7c90d8fd3863eecdfaf380c9dea628b332474' 
  AND token = '1wbeuUCdTpCquMJ/+0Y3brUPhAzLI+wFMk7+J+uorXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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