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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c76261c3dec59d252e4906fb09e47c76459c4a47200df3bec441461abd8424bb' 
  AND token = '2vyJNDKSWbmWgS6859V0mmmwMyPfQn48wz7wxVJNu3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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