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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96139736aa0a774637595941d8136c6957b775ca914ef79868a5b038bcf6f1b8' 
  AND token = '70/ZQX3lx1Z9DZraXp1sr0LDjNUAWtWx7jx+oI0iwkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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